Check out example codes for "how to add button to alert swiftui". It will help you in understanding the concepts better.

Code Example 1

@State var showAlert = false

var body: some View {
  Button(action: {
    self.showAlert = true
  }) {
    Text("Show Alert")
  }
  .presentation($showAlert) {
      Alert(title: Text("Title"), message: Text("Message..."),
          primaryButton: .default (Text("OK")) {
            print("OK button tapped")
          },
          secondaryButton: .cancel()
      )
  }
}

Learn ReactJs, React Native from akashmittal.com